Create and update gamemanager

Assets/Scenes/Scene1.unity

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Assets/Scripts/GameManager.cs

@@ -0,0 +1,83 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class GameManager : MonoBehaviour
+{
+    public Ghost[] ghosts;
+    public Pacman pacman;
+    public Transform pellets;
+
+    public int score {get; private set;}
+    public int lives {get; private set;}
+
+
+    private void Start()
+    {
+        NewGame();
+    }
+
+    private void NewGame()
+    {
+        SetScore(0);
+        SetLives(3);
+        NewRound();
+    }
+
+    private void NewRound()
+    {
+        foreach (Transform pellet in this.pellets)
+        {
+            pellet.gameObject.SetActive(true);
+        }
+
+        ResetState();
+    }
+
+    private void ResetState()
+    {
+        for (int i = 0; i < ghosts.Length; i++)
+        {
+            ghosts[i].gameObject.SetActive(true);
+        }
+
+        this.pacman.gameObject.SetActive(true);
+    }
+
+    private void GameOver()
+    {
+        for (int i = 0; i < ghosts.Length; i++)
+        {
+            ghosts[i].gameObject.SetActive(false);
+        }
+
+        this.pacman.gameObject.SetActive(false);
+    }
+
+    private void SetScore(int score)
+    {
+        this.score = score;
+    }
+
+    private void SetLives(int lives)
+    {
+        this.lives = lives;
+    }
+
+    public void GhostEaten(Ghost ghost)
+    {
+        SetScore(this.score + ghost.points);
+    }
+
+    public void PacmanEaten()
+    {
+        this.pacman.gameObject.SetActive(false);
+        SetLives(this.lives - 1);
+
+        if (this.lives >  0){
+            Invoke(nameof(ResetState), 3.0f);
+        } else {
+            GameOver();
+        }
+    }
+}

Assets/Scripts/Ghost.cs

@@ -0,0 +1,8 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class NewBehaviourScript : MonoBehaviour
+{
+    public int points = 200;
+}

Assets/Scripts/Pacman.cs

@@ -0,0 +1,18 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Pacman : MonoBehaviour
+{
+    // Start is called before the first frame update
+    void Start()
+    {
+
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+
+    }
+}